[v16] [kube] support SPDY over websocket protocol for PortForward #46815
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marcoandredinis
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rosstimothy
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SPDY has been deprecated for several years, and most proxies are expected to lose support in the coming months. To address this issue, Kubernetes introduced SPDY over WebSocket connections. This protocol leverages a WebSocket upgrade, but once established, it functions as a simple connection with SPDY-based framing. This pull request (PR) introduces initial support for customer-facing upgrades. Future PRs will add support for teleport-to-teleport communication using the `SPDY/3.1+portforward.k8s.io` protocol.
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Backport #46663 to branch/v16
changelog: Add support for Kubernetes SPDY over Websocket Protocols for PortForward.